Ljiljak families are mainly Croats and they are mostly from Hrvatska Kostajnica area , but often Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Glina. In Veliki Obljaj in Glina every ninth inhabitant had the family name Ljiljak.
Prevalence
About 150 people with faimily name Ljiljak live in Croatia today, in 80 households. There were 390 of them in the middle of the past century, and their number decreased significantly. They are located in the most of Croatian counties, in 19 cities and 26 other places, mostly in Zagreb (45), Petrinja (10), Split (<10), Borovac (<10), and in Samobor (<10).
Outside Croatia
Family name Ljiljak is present in 11 countries on three continents. The family name "Ljiljak " is used by small number of people in Germany and small number in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1923 in source Emigration Commission Zagreb.